function show(tag){
	var szy=document.getElementById("szy");
	var shj=document.getElementById("shj");
	var gc=document.getElementById("gc");
	if(tag=="szy"){
		szy.style.display="block";
		shj.style.display="none";
		gc.style.display="none";
	}else if (tag=="shj") {
		szy.style.display="none";
		shj.style.display="block";
		gc.style.display="none";
	}else {
		szy.style.display="none";
		shj.style.display="none";
		gc.style.display="block";
	}
	
}